Baumer FLDK 110G1003/S42 User Manual - Page 6
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Principle of operation
Described simply, the SCATEC-2 consists of a laser light source and two photodetectors. The beam is
aimed diagonally at the objects to be detected. Photodetector R is located close to the laser light source
and photodetector V a little further away. The sensor measures the ratio between signal v (light scattered
forward) and signal r (light scattered backward).
The ratio v/r differs widely depending whether the beam strikes on a flat surface or on an edge. When an
edge moves into the laser beam, the direct line of sight from detector V to the point of contact of the laser
Manual SCATEC-2
Version 2021-09
is obstructed, which reduces signal v, and the edge also
increases the backward scattering, causing signal r to
increase. Both effects cause ratio v/r to become substantially
smaller than with a flat surface. If ratio v/r falls below a
specific level, the sensor interprets this as an edge.
This principle of operation clearly demonstrates that:
The orientation of the object to the beam is significant.
An edge facing towards the beam creates a small ratio v/r, in
contrast to an edge facing away from the beam.
Edge detection is independent of the color, as only the
ratio of the light intensities and not the absolute value is used
for detection.
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